つけてた

was wearing, had on, was following

→ つける
つけ put on, attach + て Te-form (conjunctive form) + た Past tense
verb · informal, imperfect tense Rare #31,936
was wearing, had on Colloquial contraction of つけていた.
JA: 彼は新しい時計をつけてた。
EN: He was wearing a new watch.
was following Colloquial contraction of つけていた.
JA: 誰かが私の後をつけてた。
EN: Someone was following me.
Conjugation of つける
Imperfect
つけてた

同じ香水をつけてたよ

You were wearing the same perfume.

— エブリシング・エブリウェア・オール・アット・ワンス (2022)

ヘルメットは、つけてたの?

Were you wearing a helmet?

メアリーは、彼女が一番好きなネックレスをつけてたよ。

Mary was wearing her favorite necklace.

私のあとをつけてたの?

Were you following me?

つけてたのか?

Did you have it on?

— オープン・ユア・アイズ (1997)

メアリーはお気に入りのネックレスを身につけてたんだ。

Mary was wearing her favorite necklace.